Effect of Different Factors on Dynamic Shear Modulus of Compacted Loess

Loess dynamic parameters are extensively affected by earthquakes. Accurate determination of loess dynamic parameters plays a significance to solve the geotechnical engineering problems related to the earthquake. The dynamic shear modulus (DSM) is one of the most relevant dynamic parameters. The GDS high system of dynamic triaxial test imported from the UK was adopted to test the DSM of compacted loess with different water contents, dry densities, confining pressures, consolidation stress ratios, and loading frequencies. Experimental results presented the DSM decreased with the increase of water content, but increased with the increase of dry density, confining pressure, consolidation stress ratio, and loading frequency. The initial DSM had a nonlinear relationship with water content and loading frequency, and a linear relationship with dry density, confining pressure, and consolidation stress ratio. Water content, dry density, confining pressure, consolidation stress ratio, and loading frequency were independent variables, linear regression analysis was carried out on the dependent variable (initial DSM), and the influenced degree of each factor on the DSM and the regression equation were obtained. The innovative contribution of this study is that provides a basis for seismic response and seismic stability analysis of the loess field.